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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a06a6cb454305259c34e0b2df46275fcd5429569270811eb5d3a7174db1a23' 
  AND token = '+f0p2AcsYecDuYDdRdLdNXMQyrFFJbbit9jqeYkP6UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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