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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056af4dd744247c898f71b6458008d7de781c471cdb590e42b907d98ee684496' 
  AND token = 'vrEwsKwVzsQvXrqOelSzjOzimU4WdNiUPBmtML/AGqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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