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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db47a5db8fe694c1bfabe3a84c4491a936ff06493ff0c5a68ea2c10ef623d5f' 
  AND token = 'k1wUgSrMQJdTMCbEXL72xratgDV1N9ru8/uClEzweO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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