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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87969b3bac718629de6adc1ea865931f374855fd67a7e516c89f94c8dc332684' 
  AND token = 'fk/Na6QzWU9+YUM2f/2zTI120713iFUNqx5p9Fu0jP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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