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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a7cf0ef1b743071e90abc025d0dc3a6d76946f1d7b1879213bbf240f2a90ae' 
  AND token = 'TledrAfl9ZZXKpfbtPuqmy2TxQESut77PVWu+hhf58o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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