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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe19e7fad9a489ff2c7694ea7493032e1cd16e4d5736b2abb0b312a1f1d3add' 
  AND token = 'BUn0YmPVSuWXl0Zs09s78yYojSXLGVQNHYWIkbm8ThU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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