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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c808b7680f5ed6abfa6dea06d16ee408c6720e35fded1c28cad5a2f97a30f6' 
  AND token = 'J9Khnbz4cw/TMp5VTD9jvlu5BTUA3pqNXNuQMHJn/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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