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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84110d61c515c447a7d0a23339659c0ee4ca2493a74c10c197c6745820c22cec' 
  AND token = 'yuhoJD+buV63xbDbUTfp9yngCVV6F4ynqlBvdLZpnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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