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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5eed43339414323937794f5adbd101c19bd846d7a6adbde047f4262d97eeae6' 
  AND token = 'gL/LvYVWlYw9Gi5I3j+S27dm+i2VX4VNKynxUVWARPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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