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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02b6395c99cba26bd4795284c02b146146d536097b6d7995810b842e45aa59a' 
  AND token = 'Uo8dKI81MkW09PVMkzW3wBiLnUn6pA90TXa3NBRvkNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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