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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f67d663d4a65db2eaf878789ccac9c45048b9b8536d3e24865bc6d35da3176' 
  AND token = 'hZ1NHxZoGFo5kmagc77wtvx82dQ4+CqftQrmdP9tNz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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