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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e86bcc2911d2c430a2bbd76b7eef4037bd0c2ad2b0917c06e808ea7f72177a8' 
  AND token = 'N89oY7U/kticoWZzTjWkURD6WeUMHiiul4Hn+i5xyUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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