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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13a4f22c3e3e1799b167454c067b13a6b0a18ffbf01e1bffbddc36e5f951767' 
  AND token = 'o6wEHDW45kBacFWUs73VpKpsX5V0Gg5TUtWjHVQ1aM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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