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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c592ff820d589cebd93819d3e4f042be5b3a746565e6dc285fb93bb3f0fc1cd7' 
  AND token = 'zpK3TWGATJSkTXx6VmvmG5aX7rhswbAT5DGiGh7XWww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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