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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0480bbb835974b9b716bdd903f211234b224f7e04ce751ecb2ffda3aeb20c046' 
  AND token = 'uLydBEb7ltudOXkzaGCgu/r9NZmBbLv1shV3CDO5/44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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