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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58392efa85832f326ceec6b1a273aa09ce7bd7a08a541243d295f9d68f520a91' 
  AND token = 'thBrhoQYB/2M2f6Tpd8lxv7IxSqNSK3P6n1ILSpQGZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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