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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada9b66c1ce8a03988fd86836d2a17ae88c4c64799d1f264ecd629440e0706bc' 
  AND token = 'NayKZO0BDOhzb9sTIX1o/k+WY3TEtgrvQN65rC8sOdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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