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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d4895879cd34cd6cbaad89264f1941d111242575c81fcd728bbaf5dd68dcad' 
  AND token = 'i55s50nT+inHxTUuIsY7HTpTKq1YnIcj9IAHNKD7iGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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