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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03ecc0e92abf87197c425b52a3bed7c66f534c4bd73964dae6acb1e8367c198' 
  AND token = '7G7Bo78ewVv3J43PWJSLztPqDzVeTIL6/ze5Ou1Tznw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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