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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93260cb663da1990ca86a4e5c8d2eb4ec10e142ea906b65d77a2de71645de51b' 
  AND token = '32aZwRluq7xIzTu6mW9a3w2KbjGz+FStyu/4UqZCbRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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