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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c527157e6afa19c27f10b05d0782608c2357f0cced8b8124e79108f1403db9c' 
  AND token = 'Gl02WLWA3Y2mWiFIkm6ofrGWip8oAAozWobsqMaTmA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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