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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a05683370b4f1aad4c80d95f86760a8329f4b5bc8a4c851114e6de674d298f' 
  AND token = 'ujNQw5h0CM5Tnc83autD3AX3+OB/wrx48VOKVf1pLWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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