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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acd9cf738c935e159f7be7ec8ee5f0a09bd82c114ee2b3649382a8a2ab4b3cb' 
  AND token = 'OvpnexCNLbVU42RPN6bO4vyq9GbqbehlHoEYgIzC0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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