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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244a85695854af4abe61f2c5e07177d871a362ab0526d8244006b1d8d6256e74' 
  AND token = 'nUsX8rFMPEiEDdBv9F2eGUr4VhqwGc0B1zOJbbgu5Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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