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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebe9888ecca302418acbde348b1bb1af3b622276b01268dea68e980d9e18945' 
  AND token = 'cOzvhCHy8mEyOn44l5hd1qSlikwUpJgfUuAASjUJT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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