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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915cfaf4ccc089c80ae178145a2b24fbc887c91300199b6f044212f8cc2aa9b3' 
  AND token = 'whYU6jl9My0PxYBOf+XQ9HIZAy2Lukjdet56fyOYXnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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