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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687b228ec7f29fc2eed86bfb974ba5158cffeb41b9d0cc957549a481d5c16ecd' 
  AND token = '362XmfibBDb3AnsK/4M79ekfyGvYHG8E2hDDmTriC/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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