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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9a67cec40e54bd7360f1d8f6c4c5b21407e7916af0d1e6aad9b3f55a4dff84' 
  AND token = 'gH2ds1aCnK/nC/o4LuGEsnCivfxkafa1E28k2mg4VW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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