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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34d30305bb80c6f2b01b9d14ad4ca0c5d62d83d062bdf47dde9331b02d9a394' 
  AND token = 'gDfaut+PBaKtiFvaEbt1XdXAct19dsaq0GdsM1vUFT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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