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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cd23d30b1442fc94ebe5fad590d3632acbfaa3310585c254a2c0ffa44d41f3' 
  AND token = 'elgoOj/6YRExLcDxGxBKutdYCt7s06M07Y6C0Vw+qc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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