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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed15c7dad1d9051ae1f59209cc14cb75c56723a54a3f321cdb58b6184684142e' 
  AND token = 'Xho2fhXkTksANJWfCSEfwYjEvLBOn0IR7H6CKON5hIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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