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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03595ff8199235e6626f17e2d0e510befd6a4d491c8ed2649998d22a906c07c9' 
  AND token = 'Vhhy3JEXVAYzK+H+8/L+ibXOR9tOp9ztoU1+BbH+J8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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