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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bf758c5a44bde18d43f3d787ea8e1cba7adea50e09d75adb8aa8138c9cfb9d' 
  AND token = '+Aw5h6sSbVEx7ky8DOQ7jXhzZWGqs/lEpxmkzV1l1os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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