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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff72f12ff2a970d96320cf38fdf76c0ae0996ffcfbe970a78a13b10d7d214ead' 
  AND token = 'K4z0feF+3DlOeGt4GEDgA93LwjVo7NemBNhI3uHxoEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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