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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85acac1feaab36e4a957714235acfdd34e5948b6b45752222a7852737ecfc32' 
  AND token = 'i0ljmdDvOsp62rSDqtJ91UUu0+5O5x09jCfk9rLvvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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