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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c174900aca641c37baaa3bf71eba3a668994d7c6dc23021ea2c2192d1bee46e' 
  AND token = 'M9TCahqyzE3uTBsszjoUIeGQlCKrKQT3jT99BbCgySM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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