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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a22645e7f6170da2696d24b63ecda7b40ed23773e3e9807349a7ddb150991a' 
  AND token = 'W3591wDr8pVa/r5eybqdMnbfdCmaxqr7ZfLcp2wT7Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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