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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4d4647e44f87c4b40e7bd51cb61676cadc6971a0133e60df60ad532aef7a15' 
  AND token = 'F+2wDblLxAEORILkgakKUSEA06A8NcAknRN7t0Hj3wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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