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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4adf422995be633ca600c1f33f40c1525d17a559f823fdea5487ece6dfee21d' 
  AND token = 'iVdkwDFl/jivwH2yE5Hjj/c+Tels8YYGsyOG/r/AABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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