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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96a325b00f5f889e5f046aaac745ab3541b92905513c22faf80e1fd956e68ae' 
  AND token = 'khwy/U1wz8McqbTJisqsYWxmksXii+We/wKmpwdPN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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