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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79e9059b7643670b8ff870b215215acb70047aee51447b456e69b16fa8ca84e' 
  AND token = 'ug/AprjPQtHC+wIEQVfcw0Nb0wvXTJP6S+Ek1LUR3xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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