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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d0de7c95abc54db6347147a7472d4850550bec9e024eaa2986ffa8c1d0de7f' 
  AND token = 'Lnj0MV0kZTtJ5JI8LCx+weMxV3lulzeIeo6RzRU5qz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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