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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69304f3a2817c3d00b52e8cf951fcbbd03e2fb5745895afd859905c946d23d1e' 
  AND token = '3+oHyvyGhDF6WTN9Hg37m3Jq5LylXuekQ3iDoLe3NU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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