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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56fcfbe1ae3b5200836da545086687fa4e08836aea5569cac0ca1372ebfbb82' 
  AND token = 'm0+UTqCQccZnpq7VBQI9F63yWlB9jN0rAbWGx5PA790=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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