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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da00e90402e3099eb35413b1881b33aefffb851ee90ce91b8d6c3e9cda8e4edb' 
  AND token = 'eFlr8xRu7xNKmvr9/wMop+mjh/xiprGBxHvUo0pgD1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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