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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8062d5fa43a8de1a362294d9671f5d4e014078182a65ce00364012321d323b51' 
  AND token = 'jzzNbSIvrypFgqr9D2fRv++6jJs+Ac4Wp+wkkQAFtzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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