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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f478de473126e158a4ccb3b22249a782c3be7b33eac400ba1dcea7fc78bee538' 
  AND token = 'ZB0Uu8+2I2kY+F8Tjv91Xm5FsJwV+xUXZoQGQiCFkbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}