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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf4b8f412a1a073491055e400668815108bce4a358526afe76d96e461bf6e84' 
  AND token = '2MCM5a0g3FdtEPesyMAtMJY6TCRM3xDwHuLPADGg1uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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