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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3abb0834df412bfb02842f7db800955fd7ba93e6f00a6fe367a1974163fb62' 
  AND token = '1Z8b4fep8MmzWZzoqeJ4AIrMR5Gzpb8SsMmmK9Y+qYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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