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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb464309afc1a6dc314e5d946a3ff904589d0bd9177807dd96488d9233771780' 
  AND token = 'eVqb05o8iU9ir6QP31o5MX2wSFMDLsgnNoW8Suq8EDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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