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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137dcdb2fbe2ef3bb818e81388054de4797d1ba7f998d43d944807d967267230' 
  AND token = 'NjZDFCf9eQryLr+JPb1e4Nev2ELMt4n/D4I33dA3GdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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