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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47029915f2c360d25862cda2b4f51cba7be45b141c1f40e7652da26d61cd46a3' 
  AND token = 'yOW3/Iioqfrpz9XG+8m6IU30IYAeYvy25LaURkIECIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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