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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c15a6152040a8d9ea42275744172481d3cca41675d3e0c8a7d468579156f35' 
  AND token = 'j7nQUTyItyNPp9pRGpexNCQIzjH7el6f6I3KYH6P/YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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