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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb106bbbe96c12a6275160ee8498108de870c46ca12b74cd27e29ffef240e60' 
  AND token = 'v7IUW9i0waJhhCOHkmjEGWbRumYCAOqr4RoY6iKEZsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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