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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8b6bd08e27ecd819e23c56e088f847ad90462c0b9444143e42d7b8a6ca0c74' 
  AND token = 'YlELjvsldwLosolhUd7iCQYVnjgAEfkowvzQlDWv4+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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