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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99114442ea286e80ce0aa1ba32267d62856678a3cfe4a695b3e240ad45bb56bb' 
  AND token = 'eUorqDGuDjRb5vY6Yp9z8uPSUMgGAY+MTc0St/KRVLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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