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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd8b5f164d3b4d8e76856921917b10707510ea81930f5c9b263b8e73168b6f5' 
  AND token = 'kEstcl9Bf4QFeaKlnCwHcHqXDBCN7M515/g5Yp3uA8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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