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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf0f29034e0675e8c0c268b66f6fa87afb4bd05aea9550d01b82e879b5eb6c8' 
  AND token = 'ucpOk5AWIH7fEnxmSEgc4/qgsmkVrBivwOXGzWRg4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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