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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cd06ed977159f09cdc0782a14e39395f82835eaca5764e16da4a252f42f313' 
  AND token = 'az5sGHIwy2ykpkVJNYToV8JM9Zcbg3kip7mstGkSRQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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