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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4641e912245b04dc2b46848ec3bea4f21bcd8dc4dc28292325b1772a75067ff' 
  AND token = 'rWQEGK/eWDRbHlD2ZQTK1KFQxD5XlvtLLzho+Z9xv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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