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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4fc350c4da77cef2f3272cdf5f7e2977a4ccd15ebbb4e9f0c20d10d7a1e85a' 
  AND token = 'sIgBqYGo/DWZHa4Q2Hw2aVvDTLnVS6nrNdt42QjgHAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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