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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa81b030e2446f9ae9011fe19595eb44f48173a8027c1b66bf6b153a23028c7e' 
  AND token = 'hx0TyvbbgZsOxkzefiNUbvIwFqaVMY3dW9SBrmsKKM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00336

JSON explain

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