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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5321901c0a24dd4b471924fd6b3daca8ae8338ac7e4f709b146daeca788d52' 
  AND token = 'pyuRvCcPadk82NzKNJW2LRogAVqumlxjgZUzgqq0iuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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