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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175955b2db2a0a9ce2f34526009dea459700fb1b9826a78cc7cf0cb52c5dbd0e' 
  AND token = '/IKqTyT1+T/5zRBNwLjVru4y5xIq4xkeo9s7dkw1dZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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