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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98419371ff844b82332759c9f55fc61ca3eb7ad2c98cb3e3cee9fb0881fe2c8c' 
  AND token = 'Jtok9dMgtKfUmluuXNm/wnKVUuDoH6HYcNDxVHkpMSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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