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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e62225742cf0950c3ed6d9662531836d2e57bd4c782a14157c1f4e85767cb2' 
  AND token = 'Y9BKCb/qxlekA6j8Rw3qOnRINg6gDkmjbd8vaV/s6PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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